1 February 1981 - Daytona 24 Hours - World Championship for Drivers and Makes

Bob Garretson, Bobby Rahal & Brian Redman (GB) win in a Porsche 935 K3/80

21 March 1981 - Sebring 12 Hours - World Championship for Drivers and Makes

Hurley Haywood, Al Holbert & Bruce Leven win in a Porsche 935 K3/80

26 April 1981 - Riverside 6 Hours - World Championship for Drivers and Makes

John Fitzpatrick & Jim Busby win in a Porsche 935 K3/80

3 May 1981 - Laguna Seca 100 Miles - IMSA - International Motor Sport Association

John Paul, Jr. 2nd in a Porsche 935 JLP-3, 11.052s behind the winning Lola T600 driven by Brian Redman

10 May 1981 - Silverstone 6 Hours - World Championship for Drivers and Makes

Harald Grohs, Walter Röhrl & Dieter Schornstein win in a Porsche 935 J

24 May 1981 - Nürburgring 1000 Km - World Championship for Drivers and Makes

Jochen Mass & Reinhold Joest 2nd overall and win S+2.0 class

24 May 1981 - Lime Rock 200 Miles - IMSA - International Motor Sport Association

Ted Field & Bobby Rahal second in a Porsche 935 K3/80, 4 laps behind the winning Lola T600 driven by Brian Readman

14 June 1981 - Le Mans 24 Hours - World Championship for Drivers and Makes

Jacky Ickx comes out of retirement to win along with Derek Bell in a Porsche 936/81

4 July 1981 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association

Mauricio DeNarváez wins in a Porsche 935 J

12 July 1981 - Watkins Glen 6 Hours - World Championship for Drivers and Makes

Rick Mears, Bob Garretson & Johnny Rutherford third in a Porsche 935 K3/80, 5 laps behind the winning Lancia Beta Montecarlo Turbo driven by Riccardo Patrese & Michele Alboreto

26 July 1981 - Sears Point 100 Miles - IMSA - International Motor Sport Association

Gianpiero Moretti fourth in a Porsche 935/81, 1 lap behind the winning Ford Mustang Turbo driven by Klaus Ludwig

2 August 1981 - Portland 100 Miles - IMSA - International Motor Sport Association

Gianpiero Moretti second in a Porsche 935/81, 1 lap behind the winning Lola T600 driven by Brian Redman

16 August 1981 - Mosport 6 Hours - World Championship for Drivers and Makes

Rolf Stommelen & Harald Grohs win in a Porsche 935 M16

23 August 1981 - Road America 500 Miles - World Championship for Drivers and Makes

Rolf Stommelen & Harald Grohs win in a Porsche 935 M16

30 August 1981 - Mid-Ohio 500 km - Non Championship Race

Rolf Stommelen & Derek Bell win in a Porsche 935 M16

13 September 1981 - Road Atlanta 150 Miles - IMSA - International Motor Sport Association

Ted Field second in a Porsche 935 K3/80, 1 lap behind the winning Lola T600 driven by Brian Redman

27 September 1981 - Brands Hatch 1000 km - World Championship for Drivers and Makes

Bobby Rahal & Bob Garretson 2nd overall and 1st in GTX class in a Porsche 935 K3

6 November 1981 - Kyalami 9 Hours - Non Championship Race

Jochen Mass & Reinhold Jöst win in a Porsche 936

29 November 1981 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association

John Paul, Jr. wins in a Porsche 935 JLP-3